Fig. 4

Effect of pressure on p*. a Magnitude of the upturn in ρ(T) at T → 0 and for H = 33 T as a function of doping, for ambient pressure (blue), P = 1.0 (purple) and 2.0 GPa (red), obtained from ambient pressure data (Fig. 3a) and from pressure data at p = 0.21 (Fig. 3b), p = 0.22 (Fig. 2c) and p = 0.23 (Supplementary Fig. 7). The pseudogap critical point p* is where the upturn goes to zero (arrow). b R _H(0) vs doping for ambient pressure (blue), P = 1.0 (purple) and 2.0 GPa (red), obtained from ambient pressure data at p = 0.21, 0.22 and 0.23 (Fig. 3c) for H = 33 T, and p = 0.25 (Supplementary Fig. 4) for H = 16 T, and from pressure data at p = 0.21 (Fig. 3d) and p = 0.22 (Fig. 2d) for H = 33 T, and p = 0.25 (Supplementary Fig. 4) at H = 16 T. All lines are a guide to the eye. The effect of pressure is to shift p* down in doping (grey arrows), by roughly dp* = −0.02 for 2.0 GPa. All the error bars reflect the uncertainty on the extrapolation to T = 0